I have 4x4 GB memory (Corsair Vengeance® Low Profile — 16GB (4x4 GB) Dual/Quad Channel DDR3 Memory Kit (CML16GX3M4A1600C9)). Using 2 of them the pc boots, but the onboard error LED shows 51. With all four it's purely luck if it boots, but usually I get a blue screen (LED = 51).
What to do? Buy new/other ones?
Intel I7-4770K
Gigabyte GA-Z87X-UD5 TH
Power supply: Corsair RM750
W7 Home Premium 64-bit